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Transverse waves in a post-flare supra-arcade

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Verwichte, E. (Erwin), Nakariakov, V. M. (Valery M.) and Cooper, F. C. (Fenwick C.). (2005) Transverse waves in a post-flare supra-arcade. Astronomy & Astrophysics, Vol.430 (No.3). L65-L68. ISSN 0004-6361

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Abstract

Observations of propagating transverse waves in an open magnetic field structure with the Transition Region And
Coronal Explorer (TRACE) are presented. Waves associated with dark tadpole-like sunward moving structures in the post-flare supra-arcade of NOAA active region 9906 on the 21st of April 2002 are analysed. They are seen as quasi-periodic transverse displacements of the dark tadpole tails, with periods in the range of 90–220 s. Their phase speeds and displacement amplitudes decrease as they propagate sunwards. At heights of 90 and 60 Mm above the post-flare loop footpoints the phase speeds are in
the ranges 200–700 km s −1 and 90–200 km s
−1 respectively. Furthermore, for consecutive tadpoles the phase speeds decrease and periods increase as a function of time. The waves are interpreted as propagating fast magnetoacoustic kink waves guided by a vertical, evolving, open structure.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Magnetohydrodynamic waves, Solar oscillations, Solar magnetic fields, Solar flares
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: February 2005
Volume: Vol.430
Number: No.3
Page Range: L65-L68
Identification Number: 10.1051/0004-6361:200400133
Status: Peer Reviewed
Access rights to Published version: Open Access
Funder: Royal Society (Great Britain), Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
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URI: http://wrap.warwick.ac.uk/id/eprint/3597

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